Implement base64 decoding option on transit decrypt page.

This completes #14

src/main.js

@@ -125,6 +125,7 @@ document.addEventListener('DOMContentLoaded', function () {
 
   setInterval(async () => {
     if (pageState.currentPage != "UNSEAL") {
+      if (!localStorage.getItem('apiurl')) { return; }
       let sealStatus = await getSealStatus();
       if (sealStatus.sealed) {
         changePage("UNSEAL");

src/pages/Transit/TransitDecrypt.js

@@ -30,6 +30,24 @@ export class TransitDecryptPage extends Page {
             name: "ciphertext",
           }
         })),
+        Margin([
+          makeElement({
+            tag: "div",
+            class: "uk-form-label",
+            text: "Should the plaintext be base64 decoded?",
+          }),
+          makeElement({
+            tag: "div",
+            class: ["uk-form-controls", "uk-form-controls-text"],
+            children: makeElement({
+              tag: "input",
+              attributes: {
+                type: "checkbox",
+                name: "decodeBase64Checkbox",
+              }
+            }),
+          }),
+        ]),
         makeElement({
           tag: "p",
           id: "errorText",
@@ -56,7 +74,11 @@ export class TransitDecryptPage extends Page {
     let formData = new FormData(this.transitDecryptForm);
 
     transitDecrypt(pageState.currentBaseMount, pageState.currentSecret, formData.get("ciphertext")).then(res => {
-      let modal = CopyableModal("Decryption Result", res.plaintext);
+      let plaintext = res.plaintext;
+      if (formData.get("decodeBase64Checkbox") == "on") {
+        plaintext = atob(plaintext);
+      }
+      let modal = CopyableModal("Decryption Result", plaintext);
       pageContent.appendChild(modal);
       UIkit.modal(modal).show();
     }).catch(e => {

src/pages/Transit/TransitEncrypt.js

@@ -41,7 +41,6 @@ export class TransitEncryptPage extends Page {
             class: ["uk-form-controls", "uk-form-controls-text"],
             children: makeElement({
               tag: "input",
-              class: ["uk-checkbox"],
               attributes: {
                 type: "checkbox",
                 name: "base64Checkbox",
@@ -74,7 +73,8 @@ export class TransitEncryptPage extends Page {
 
   transitEncryptFormHandler() {
     let formData = new FormData(this.transitEncryptForm);
-    let encodedData = formData.get("base64Checkbox") ? formData.get("plaintext") : btoa(formData.get("plaintext"));
+    let encodedData = 
+      formData.get("base64Checkbox") == "on" ? formData.get("plaintext") : btoa(formData.get("plaintext"));
     transitEncrypt(pageState.currentBaseMount, pageState.currentSecret, encodedData).then(res => {
       console.log(res);
       let modal = CopyableModal("Encryption Result", res.ciphertext);